package com.ibm.cloud.envcheck.kit;

import java.io.BufferedWriter;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class FileUtils {

	public static final List<String> findjarFiles(String baseDirName, final Collection<String> includeJars,
			final Collection<String> scanPackages) {
		List<String> classFiles = new ArrayList<String>();
		JarFile localJarFile = null;
		try {
			File baseDir = new File(baseDirName);
			if ((!baseDir.exists()) || (!baseDir.isDirectory())) {
				throw new RuntimeException("file serach error" + baseDirName + " is not a directory");
			}
			String[] filelist = baseDir.list(new FilenameFilter() {
				@Override
				public boolean accept(File dir, String name) {
					if (includeJars == null)
						return true;
					return includeJars.contains(name);

				}
			});
			for (String fileName : filelist) {
				localJarFile = new JarFile(new File(baseDirName + File.separator + fileName));
				Enumeration<JarEntry> entries = localJarFile.entries();
				JarEntry jarEntry;
				String entryName;
				while (entries.hasMoreElements()) {
					jarEntry = (JarEntry) entries.nextElement();
					entryName = jarEntry.getName();
					if (scanPackages==null||scanPackages.isEmpty()) {
						if (!jarEntry.isDirectory() && entryName.endsWith(".class")) {
							String className = entryName.replaceAll("\\"+File.separator, ".").substring(0,
									entryName.length() - 6);
							classFiles.add(className);
						}
					} else {
						for (String scanPackage : scanPackages) {
							scanPackage = scanPackage.replaceAll("\\.", "\\" + File.separator);
							if (!jarEntry.isDirectory() && entryName.endsWith(".class")
									&& entryName.startsWith(scanPackage)) {
								String className = entryName.replaceAll("\\"+File.separator, ".").substring(0,
										entryName.length() - 6);
								classFiles.add(className);
							}
						}
					}
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (localJarFile != null)
					localJarFile.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return classFiles;
	}
	
	public static void WriteFileFromInputStream(InputStream inputStream,File targetFile){
		DataOutputStream outputStream  = null;  
	    try {
	        outputStream = new DataOutputStream(new FileOutputStream(targetFile));
	        int len = inputStream.available();
	        //judge if file length >1M 
	        if (len <= 1024 * 1024) {
	            byte[] bytes = new byte[len];  
	            inputStream.read(bytes);  
	            outputStream.write(bytes);  
	        } else {  
	            int byteCount = 0;  
	            //read one by one
	            byte[] bytes = new byte[1024*1024];
	            while ((byteCount = inputStream.read(bytes)) != -1){  
	                outputStream.write(bytes, 0, byteCount);  
	            }  
	        }
	    } catch (Exception e) {  
	        e.printStackTrace();  
	    } finally {
	        try {
				outputStream.flush();
			} catch (IOException e) {
				e.printStackTrace();
			}
	        try {
				inputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}  
	        try {
				outputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}  
	    }
	}
	
	public static void writeFileFromArray(List<String>list,File targetFile){
		FileOutputStream fos = null;
		OutputStreamWriter osw = null;
		BufferedWriter  bw = null;
		try{
			fos=new FileOutputStream(targetFile);
	        osw=new OutputStreamWriter(fos, "UTF-8");
	        bw=new BufferedWriter(osw);
	        for(String arr:list){
	            bw.write(arr+"\t\n");
	        }
		}catch(Exception e){
			e.printStackTrace();
		}finally{
			if(bw!=null){
				try {
					bw.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(osw!=null){
				 try {
					osw.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(fos!=null){
				try {
					fos.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}

		}        
	}
	
	/** 
     * 从包package中获取所有的Class 
     * @param pack 
     * @return 
     */  
    public static List<Class<?>> getClasses(String packageName){  
          
        //第一个class类的集合  
        List<Class<?>> classes = new ArrayList<Class<?>>();  
        //是否循环迭代  
        boolean recursive = true;  
        //获取包的名字 并进行替换  
        String packageDirName = packageName.replace('.', '/');  
        //定义一个枚举的集合 并进行循环来处理这个目录下的things  
        Enumeration<URL> dirs;  
        try {  
            dirs = Thread.currentThread().getContextClassLoader().getResources(packageDirName);  
            //循环迭代下去  
            while (dirs.hasMoreElements()){  
                //获取下一个元素  
                URL url = dirs.nextElement();  
                //得到协议的名称  
                String protocol = url.getProtocol();  
                //如果是以文件的形式保存在服务器上  
                if ("file".equals(protocol)) {  
                    //获取包的物理路径  
                    String filePath = URLDecoder.decode(url.getFile(), "UTF-8");  
                    //以文件的方式扫描整个包下的文件 并添加到集合中  
                    findAndAddClassesInPackageByFile(packageName, filePath, recursive, classes);  
                } else if ("jar".equals(protocol)){  
                    //如果是jar包文件   
                    //定义一个JarFile  
                    JarFile jar;  
                    try {  
                        //获取jar  
                        jar = ((JarURLConnection) url.openConnection()).getJarFile();  
                        //从此jar包 得到一个枚举类  
                        Enumeration<JarEntry> entries = jar.entries();  
                        //同样的进行循环迭代  
                        while (entries.hasMoreElements()) {  
                            //获取jar里的一个实体 可以是目录 和一些jar包里的其他文件 如META-INF等文件  
                            JarEntry entry = entries.nextElement();  
                            String name = entry.getName();  
                            //如果是以/开头的  
                            if (name.charAt(0) == '/') {  
                                //获取后面的字符串  
                                name = name.substring(1);  
                            }  
                            //如果前半部分和定义的包名相同  
                            if (name.startsWith(packageDirName)) {  
                                int idx = name.lastIndexOf('/');  
                                //如果以"/"结尾 是一个包  
                                if (idx != -1) {  
                                    //获取包名 把"/"替换成"."  
                                    packageName = name.substring(0, idx).replace('/', '.');  
                                }  
                                //如果可以迭代下去 并且是一个包  
                                if ((idx != -1) || recursive){  
                                    //如果是一个.class文件 而且不是目录  
                                    if (name.endsWith(".class") && !entry.isDirectory()) {  
                                        //去掉后面的".class" 获取真正的类名  
                                        String className = name.substring(packageName.length() + 1, name.length() - 6);  
                                        try {  
                                            //添加到classes  
                                            classes.add(Class.forName(packageName + '.' + className));  
                                        } catch (ClassNotFoundException e) {  
                                            e.printStackTrace();  
                                        }  
                                      }  
                                }  
                            }  
                        }  
                    } catch (IOException e) {  
                        e.printStackTrace();  
                    }   
                }  
            }  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
         
        return classes;  
    } 
    public static void findAndAddClassesInPackageByFile(String packageName, String packagePath, final boolean recursive, List<Class<?>> classes){  
        //获取此包的目录 建立一个File  
        File dir = new File(packagePath);  
        //如果不存在或者 也不是目录就直接返回  
        if (!dir.exists() || !dir.isDirectory()) {  
            return;  
        }  
        //如果存在 就获取包下的所有文件 包括目录  
        File[] dirfiles = dir.listFiles(new FileFilter() { 
        //自定义过滤规则 如果可以循环(包含子目录) 或则是以.class结尾的文件(编译好的java类文件)  
              public boolean accept(File file) {  
                return (recursive && file.isDirectory()) || (file.getName().endsWith(".class"));  
              }  
            });  
        //循环所有文件  
        for (File file : dirfiles) {  
            //如果是目录 则继续扫描  
            if (file.isDirectory()) {  
                findAndAddClassesInPackageByFile(packageName + "." + file.getName(),  
                                      file.getAbsolutePath(),  
                                      recursive,  
                                      classes);  
            }  
            else {  
                //如果是java类文件 去掉后面的.class 只留下类名  
                String className = file.getName().substring(0, file.getName().length() - 6);  
                try {  
                    //添加到集合中去  
                    classes.add(Class.forName(packageName + '.' + className));  
                } catch (ClassNotFoundException e) {  
                    e.printStackTrace();  
                }  
            }  
        }  
    }  

    
    
    
    public static List<Class> getAllClassByInterface(Class c,String packageName) {  
        List<Class>  returnClassList = null;
        if(c.isInterface()) {
            // 获取当前包下以及子包下所以的类  
            List<Class<?>> allClass = getClasses(packageName);  
            if(allClass != null) {  
                returnClassList = new ArrayList<Class>();  
                for(Class classes : allClass) {  
                    // 判断是否是同一个接口  
                    if(c.isAssignableFrom(classes)) {  
                        // 本身不加入进去  
                        if(!c.equals(classes)) {  
                            returnClassList.add(classes);          
                        }  
                    }  
                }  
            }  
        }
        return returnClassList;  
    }  
}
